Battery cup



J. M. OLIN.

BATTERY CUP.

APPLICATION FILED APR. 17, I922.

Patented Dec. 12, 1922.

Patented Dec. 112, 1922.

JOHN M. OLIN, OF EAST ALTON, ILLINOIS WESTERN CARTRIDGE COMPANY, OF E DELAWARE.

BATTERY CUP.

, kl Application filed April 17, 1922. Serial No. 554,313.

To all whom it may concern;

Be it known that I, JOHN M. OLIN, a citizen of the United States, and residing at East Alton, county of Madison, Illinois, have invented the new and useful Improvement in Battery Cups, of which the followin is a specification.

his invention relates to cartridges, and more particularly to battery cups therefor.

A cartridge is provided with a battery cup, which is closed at one end by a primer cap, which latter is provided with the priming composition, while the other end of the battery cup has a flash hole. In the primer cavity thus formed is arranged an anvil cooperating with the primingcomposition to effect ignition of the charge in the cartridge. The primer cavity is, however, partly empty; accordingly where powders of fine grain are used for the charge, there is a tendency of the individual grains of powder to sift into the flash hole leading from the primer cavity of the battery cup; accordingly when the explosion takes place, the primer cap is liable to be blown fromthe battery cup and fractured, or gas is liable to'leak around the edge of the cap or through the side walls of the battery cup obviously, this is not only objectionable but it is liable to cause damage.

One of the objects of this invention, therefore, is to provlde a battery cup, in which such sifting is prevented.

Further objects will appear from the detail description taken in connection with the accompanying drawing, in which 2 Figure 1 is a section of a cartrldgeshell showing the battery cup embodying this invention;

Figure 2 is an enlarged section of the battery cup; and

F igureB is a longitudinal section of a metallic cartridge, showing another embodiment of this invention.

Referring to the accompanying drawing, and more particularly to Figure 1, the cartridge is shown as a shot-gun shell comprising a paper .tube 1, 'a base 2 and a base wad 3 .provided with a recess 4 for receiving{ the battery cup.

eferring to Figure 2, the battery cup comprises a casing 5 open at one end and provided with a flange 6; in this open end is forced the usual primer cap 7 provided i h the usu pr m g comp s tiql 8-. The

. imam ASSIGNOR, BY MESNE ASSIGNMENTS, TO AST ALTON, ILLINOIS, A CORPORATION OF other end of the battery cup is closed,-eX- cep-t that it is perforated as shown at 9 to provide a flash hole. An anvil 10 is pro vided between the cap and the closed end of the casing. This battery cup so far descrlbed may be of any suitable or usual constructlon.

It will'be seen that when the primer cavity formed in the casing is entirely open, then powder grains from the charge in the shell can sift into the cavity through the flash hole and, therefore, cause excessive eX- plosion in the primer cavity with the results previously described. In accordance with this invention, therefore, the flash hole is closed by a disc 11 which may be conveniently located between the anvil and the end of the battery cup casing. This disc 11 is in the form of a membrane so that while it effectively prevents sifting of the power powder grains into the primer cavity, it nevertheless is ruptured by the for e of theexplosion within the cavity caused by the detonation of the primer composition, so that the force of the explosion will blow out thismembrane covering the flash hole;

in this way, the ignition of the charge within the cartridge is effected and at the same time, entrance of powder grains into the primer cavity is obviated.

The membrane may be of any suitable material which will be readily ruptured when the primer is fired; preferably this membrane is of a material which is itself inflammable. A suitable material for this purpose is collodion, which is a solution of gun tion accomplishes its objects. The provision of the membrane-closing the flash hole in the battery cup effectively prevents sifting of the powder into the primer cavity but does not retard or in any Way effect the desired firing of the charge within the shell.

Figure 3 shows the application of this invention to a metallic cartridge. In such a I :artridge the primer Lasspve cap 70 and anvil 100 are issembled with the primer composition 80 .n a unit, and this unit is' placed in the primer pocket in the head of the metallic :artridge. The flash hole 90 is in this case formed'inf' the head of the cartridge and sommunlcates with the primer cavity in the cap, as'the anvil is cross-shaped to effect such communication.

In accordance with this invention the membrane 110 is placed in the primer pocket and between the flash hole and the cap. 7 The function of the membrane is the same as in the embodiment shown inFigures 1 and 2 and further description is, therefore, un-

necessary,

It is obvions that various changes may be made in details without departing from' the spirit of this invention; it is, therefore, to be understood'that this invention is'not to be limited to the specific details shown and described.

-Having thus described the invention, what is claimed is e 1. YA cartridge having a partly empty primer cavity provided with a flash hole,

and a membrane closin said flash hole.

2. A cartridge, having a partly empty primer cavity provided with a flash hole, and'anjinflammable membrane closing said flash hole. I 3'. A battery cup having a flash hole lead-' ing from a partly empty primer cavity, and a membrane over said flash hole. l

4. A battery cup having a flash hole leading from a partly empty primer cavity, and an inflammable membrane over said flash hole. I I

, 5. A. battery cup having a primer cap and provided with. a

over said flash hole.

6. A battery cup having a cavity closed atone end by a cap and having a flash hole at its other end leading from a partly empty primer cavity, anda membrane over said flash hole. i

'7. A battery cup having a cavity closed at one end by a cap having a flash holeat its other end leading from a partly empty primer cavity, a membrane between said anvil and said flash hole.

In testimony whereof I'aflix my signature this 31stday of March, 1922. I JOHN M. OLIN. I

I flash hole leading from a partly empty primer cavity, and a membrane an anvil in said cavity, and 

